using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;

namespace DS.Module.Core;

/// <summary>
/// IpHelper
/// </summary>
public class IpHelper
{
    /// <summary>
    /// 获取当前IP地址
    /// </summary>
    /// <param name="preferredNetworks"></param>
    /// <returns></returns>
    public static string GetCurrentIp(string preferredNetworks)
    {
        var instanceIp = "127.0.0.1";

        try
        {
            // 获取可用网卡
            var nics = NetworkInterface.GetAllNetworkInterfaces()?.Where(network => network.OperationalStatus == OperationalStatus.Up);

            // 获取所有可用网卡IP信息
            var ipCollection = nics?.Select(x => x.GetIPProperties())?.SelectMany(x => x.UnicastAddresses);

            foreach (var ipadd in ipCollection)
            {
                if (!IPAddress.IsLoopback(ipadd.Address) && ipadd.Address.AddressFamily == AddressFamily.InterNetwork)
                {
                    if (string.IsNullOrEmpty(preferredNetworks))
                    {
                        instanceIp = ipadd.Address.ToString();
                        break;
                    }

                    if (!ipadd.Address.ToString().StartsWith(preferredNetworks)) continue;
                    instanceIp = ipadd.Address.ToString();
                    break;
                }
            }
        }
        catch
        {
            // ignored
        }

        return instanceIp;
    }
}